include - 运行configure时如何覆盖环境变量？

Question

在 Linux 的任何主要软件包中，运行 ./configure --help最后会输出:

Some influential environment variables:
      CC          C compiler command
      CFLAGS      C compiler flags
      LDFLAGS     linker flags, e.g. -L<lib dir> if you have libraries in a
                  nonstandard directory <lib dir>
      CPPFLAGS    C/C++ preprocessor flags, e.g. -I<include dir> if you have
                  headers in a nonstandard directory <include dir>
      CPP         C preprocessor

Use these variables to override the choices made by `configure' or to help
it to find libraries and programs with nonstandard names/locations.

如何使用这些变量来包含目录？我试过运行 ./configure --CFLAGS="-I/home/package/custom/"和 ./configure CFLAGS="-I/home/package/custom/" ，但是这些都不起作用。有什么建议？

Answer 1

您需要用于 -I 的变量是 CPPFLAGS ，不是 CFLAGS . (正如您复制的帮助消息中所说的那样。)CPP 代表“C 预处理器”，而不是 C++。所以:

./configure CPPFLAGS='-I/home/package/custom'